Old(ish?) Sugino Info?

(xposted in SSFG)

I picked up a crankset at work today for next to nothing (yay "junk" bins). It's clearly meant for track use, 48T, 1/8" and 165mm. The only identifying things besides the usual crankarm junk is "Sugino No. 3". Theres some more details to it, such as the peculiar chainring mounting. It appears to have a riveted chainring, but the spider says 46-48T, implying the ring capacities? I haven't bothered to measure the BCD yet, as I haven't even figured out how to change the rings yet. I'd post photos, but I'd rather prefer information on this Sugino No. 3 as a whole.

It's bad when you're 19 and people consider you an "old geezer" in the current FG community.

Translation: Japanese » English
純正ではクランク一体型のシングルギヤが付いています.クランクは軽合のようですが,ギヤは鉄製でカシメで付いておりギヤの交換は出来ません. SUGINOのHPを見てもこの手の製品は載っておらず,すでに製造中止されているようです
Clank is genuine and lower body with a single gear. Crank case, but it is light, gear, with the iron in KASHIME gear and can not be exchanged. SUGINO HP's look at this kind of product Is not listed, already have been discontinued.

Good eyes. It is a 3/32 ring, so the crank is aimed at cheap 5 sp derailleur city bikes. The same crank and chainring is/was used with a different spider and another smaller chainring to make a double crank.